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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 627 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.66² =
  2. 2.94² =
  3. 3.69² =
  4. 4.61² =
  5. 5.43² =
  6. 6.74² =
  7. 7.59² =
  8. 8.86² =
  9. 9.33² =
  10. 10.97² =
  11. 11.77² =
  12. 12.85² =
  13. 13.58² =
  14. 14.84² =
  15. 15.72² =
  16. 16.63² =
  17. 17.87² =
  18. 18.79² =
  19. 19.52² =
  20. 20.67² =
  21. 21.56² =
  22. 22.99² =
  23. 23.46² =
  24. 24.96² =
  25. 25.38² =
  26. 26.76² =
  27. 27.31² =
  28. 28.81² =
  29. 29.49² =
  30. 30.98² =
  31. 31.41² =
  32. 32.95² =
  33. 33.93² =
  34. 34.35² =
  35. 35.36² =
  36. 36.57² =
  37. 37.34² =
  38. 38.64² =
  39. 39.44² =
  40. 40.42² =

Answer key

  1. 4356
  2. 8836
  3. 4761
  4. 3721
  5. 1849
  6. 5476
  7. 3481
  8. 7396
  9. 1089
  10. 9409
  11. 5929
  12. 7225
  13. 3364
  14. 7056
  15. 5184
  16. 3969
  17. 7569
  18. 6241
  19. 2704
  20. 4489
  21. 3136
  22. 9801
  23. 2116
  24. 9216
  25. 1444
  26. 5776
  27. 961
  28. 6561
  29. 2401
  30. 9604
  31. 1681
  32. 9025
  33. 8649
  34. 1225
  35. 1296
  36. 3249
  37. 1156
  38. 4096
  39. 1936
  40. 1764

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